title: [Influence of the quantified surface electromyography of sternocleidomastoid on cervical vestibular evoked myogenic potential].
abstract: OBJECTIVE
  This study investigated the correlations between electromyography (EMG) of sternocleidomastoid (SCM) and cervical vestibular evoked myogenic potentials (cVEMP), and intended to quantify the influence of EMG of SCM on cVEMP by recording the EMG of SCM and cVEMP in different head positions.
  
  
  METHODS
  Thirty healthy subjects (60 ears), without the history of ear illnesses, were enrolled in this study. In addition, the recruited subjects also showed favorable differentiation of cVEMP waves induced by Blackman pip cVEMP, and EMG were recorded in different head positions(with sagittal at 90°, 60°,45° and 30°angle), as well as to analyze and quantify the influence of EMG on cVEMP.
  
  
  RESULTS
  In the case of the different EMG levels: P1 latency, (12.50 ± 2.39)ms; N1 latency, (19.79 ± 3.16)ms, and the latencies shown no statistical difference (P > 0.05). The amplitude was affected by EMG level, there was significant difference between the amplitudes(F = 55.47, P < 0.01). The different head positions on subjects their EMG level or area of EMG effects were statistically significant (P < 0.01). The study found a linear dependence of the amplitude from the EMG levels(r(2) = 0.591, Adjusted-r(2) = 9.590).
  
  
  CONCLUSIONS
  The cVEMP amplitude increases as a function of EMG target level, and the latency remains constant. The quantized data will increase the amplitude in clinical diagnosis application of sensitivity, and it will improve the diagnosis of the vestibular system diseases and some related diseases.
authors.affiliation: Department of Otorhinolaryngology Head and Neck Surgery, Nanfang Hospital,Southern Medical University, Guangzhou 510515, China.
authors.forename: Bo-chen
authors.initials: BC
authors.lastname: Wang
authors.forename: Yong
authors.initials: Y
authors.lastname: Liang
authors.forename: Xiao-long
authors.initials: XL
authors.lastname: Liu
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.forename: You-li
authors.initials: YL
authors.lastname: Liu
authors.forename: Yan-fei
authors.initials: YF
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Qi
authors.initials: Q
authors.lastname: Li
mesh_terms: D000161:Acoustic Stimulation; D004576:Electromyography; D006257:Head; D006801:Humans; D009334:Neck Muscles; D015837:Vestibular Diseases / Q000175:diagnosis; D058585:Vestibular Evoked Myogenic Potentials; D014722:Vestibule, Labyrinth